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P.A. Yeoman- Australian, agricultural innovator who developed the Keyline Design System [a deep shank that is used as a subsoiler plow without inverting the soil and is done on contour].
Landscape Permanence Scale:
1- Climate
2- Landform
3- Water
4- Roads/Access Ways
5- Trees
6- Structures
7- Subdivision
8- Soil
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